The colouring is cartoonish and the poses are a little awkward, but you drew them both correctly. Even if this is kind of of a random picture, good job.

Master Chief is cool and all but Cybersix could beat him like nothing. Sure, they both jump high and can fight, but with that little knife I think she could just karate kick it then go in for the kill.

Though I don't think she could take on a life, espicially like one like herself.

this fight could go either way...master chief had a personal shield, not to mention his mjolnir armor can take a whopping amount of abuse, but Cyber Six is MUCH stronger than a regular person, and she isn't weighed down by heavy armor, yet isn't protected by it, plus Master Chief was trained to fight in a professional army since he was about six.